0008343: Exporting as backup doesn't work well when the import limit is 400kb

Description

I've been exporting test specs as backups and a few of them range from the size of 500kb to 1.2mb. The issue with that is, as far as I know from my uploading XMLs into testlink, the upload limit is 400kb.

Thus you can't import the files you've directly exported from testlink without parting them yourself.